I know the cheap ass ph meters you can buy at home depot don't work. I found this digital 4in1 meter. PH, moisture,light, and temp. Someone take a look....I just can't fork out the dough for a Hanna right now.
http://cgi.ebay.com/Digital-4in1-So...tem&pt=LH_DefaultDomain_0&hash=item4839f696c4
http://cgi.ebay.com/Digital-4in1-So...tem&pt=LH_DefaultDomain_0&hash=item4839f696c4